KR102007319B1 - system and method for detecting arc using current change and high frequency noise - Google Patents

Abstract

The present invention relates to an arc detection system and method using the current change and high frequency noise to detect the arc continuously generated in the same phase line adaptive to the indoor distribution line to prevent fire, and to the indoor distribution line An arc detection sensor unit for detecting an arc (corona) continuously occurring in the same phase line with an adaptation, a current effective value change amount detection unit for counting and outputting an amount of current effective value change in response to the arc information detected by the arc detection sensor unit, Receives the arc information detected by the arc detection sensor unit receives a current high frequency detection unit for detecting a current high frequency by applying a current tracking detection algorithm, the current effective value change amount of the current effective value change amount detection unit and the current high frequency signal of the current high frequency detection unit Sword only high frequency arc signal It will be a high frequency arc detection and, characterized in that the analyzes take the arc of the high-frequency signal output from the high-frequency arc detection made by comprising a trip signal output for outputting the breaker trips, and alarm signal output.

Description

Arc detection system using current change and high frequency noise and its method {system and method for detecting arc using current change and high frequency noise}

The present invention relates to an arc detection system and a method thereof, and in particular, an arc detection system using current change and high frequency noise to prevent fire by continuously detecting arcs generated in the same phase line that is adaptive to indoor distribution lines. And to a method thereof.

Electric fires continue to occur, and the share of electric fires accounts for about 20% of all fires. In Korea, an earth leakage breaker is installed to prevent electric fire. However, electric fires continue to occur even when the earth leakage breaker is installed in a general house.

An earth leakage breaker is a device that blocks overcurrent and leakage current, and has a great effect of preventing an electric shock accident, but is insufficient in preventing an electric fire caused by an arc. Therefore, until recently, the electric fire has not been reduced and the damage is increasing.

In 2009, 10,778 electric fires occurred, accounting for 22.8% of the total fires, 326 casualties and 58,185 million won in property damage. In other words, an average of 29 cases occur every day, causing 11 lives and property damages of KRW159 million.

In 1994, a joint investigation study was conducted to investigate the cause of electric fires based on NFPA, CPSC, and UL, which are major US disaster prevention agencies. -fault).

In addition, as a result of analyzing electric fires that occurred for 5 years from 1994 to 1998, about 73,500 electric fires are generated annually, and about 60,000 (80%) of them are reported to be fires due to arc failure.

Accordingly, in the United States, the Arc Fault Circuit Interrupter (AFCI) has been installed in the power supply circuits of bedrooms since 2002, and from 2008, arcs have been applied to most electrical circuits such as bedrooms, living rooms, study rooms, and entrances. Regulations have been tightened to install breakers. As a result, the electrical fire of the house was greatly reduced.

In addition, the development and dissemination of electrical fire prevention devices is urgently needed. In 1976, the KS4613 system was established in Korea to prevent electric shocks. However, the electric fire prevention effect has been lacking. Therefore, it is time to develop and spread the electric fire prevention device in Korea and to establish the environment.

On the other hand, with respect to the technology for arc detection for fire protection, a number of registration and disclosure other than Korea Patent Publication No. 10-2007-0005278 (hereinafter, 'priority literature') is disclosed. The above-mentioned prior document discloses a configuration for detecting and processing an arc according to a difference in voltage or a difference in current generated in an electric line of a load in use.

However, in general homes and offices using 220V, 60Hz alternating current, an arc occurs due to insulation breakdown between three phases and loosening of the screw due to vibration in the same phase line that is adaptable to the indoor distribution line. There was a risk of fire due to the high temperature above.

1 is a view showing a waveform of a voltage current when a general arc is generated.

As shown in Figure 1, the current transformer (CT) sensor for monitoring the current serves to prevent the breaker malfunction by monitoring the current, and the circuit breaker trip by counting the current high frequency distortion, current effective value change amount to prevent the breaker malfunction Output the signal.

However, the arc has a high frequency characteristic of more than a few tens of kHz, so it is very difficult to distinguish the noise from the arc, and the existing technique can be implemented by the FFT algorithm, but this technique is very vulnerable to noise and has a general current sensor. It was difficult to utilize, and there was a problem that was not suitable for high-speed diagnosis.

The present invention is to solve the above problems and arc detection system using the current change and high frequency noise to prevent fire by continuously detecting the arc occurring in the same phase line adaptive to the indoor distribution line and its The purpose is to provide a method.

Arc detection system using the current change and high frequency noise according to the present invention for achieving the above object is an arc detection sensor unit for detecting the arc (corona) continuously generated in the same phase line adaptive to the indoor distribution line and A current effective value change detection unit for receiving the arc information detected by the arc detection sensor unit to count and output the current effective value change amount, and applying the current tracking detection algorithm to receive the arc information detected by the arc detection sensor unit to detect the current high frequency A high frequency arc detection unit for receiving a current high frequency arc change unit, a current effective value change amount of the current effective value change amount detection unit and a current high frequency signal of the current high frequency detection unit, and detecting only a high frequency arc signal and outputting the high frequency arc signal; Minutes to receive arc signal It is characterized in that it comprises a trip signal output unit for outputting the breaker trip and alarm signal.

In addition, the arc detection method using the current change and the high frequency noise according to the present invention comprises the steps of detecting an arc (corona) continuously generated in the same phase line adaptive to the indoor distribution line using the arc detection sensor; Receiving the detected arc information to perform an arc counter and determining whether a current change amount equal to or greater than a current change amount set when the arc counter occurs; Determining whether an additional arc counter is generated within a predetermined period after the initial counter occurs when the current change amount is greater than the set current change amount; Continuously detecting an arc counter and an arc detection duration when the additional arc counter occurs; Determining how many times the arc counter is generated in the corresponding arc counter and the arc detection duration, each of which corresponds to a current high frequency; Outputting a trip signal of the circuit breaker and generating an alarm signal when the number of occurrences of the arc counter is higher than a reference value and the current high frequency is maintained above the reference value; Determining whether a current high frequency distortion rate is higher than a set value from the detected arc information; When the trip signal and the alarm signal of the circuit breaker is generated, it is characterized in that it comprises a step of determining whether or not to perform maintenance.

An arc detection system and method using current variation and high frequency noise according to an embodiment of the present invention have the following effects.

That is, it is possible to prevent the fire by detecting the arc continuously generated in the same phase line adaptive to the indoor distribution line.

1 is a view showing a waveform of voltage and current when a general arc occurs
Figure 2 is a schematic diagram showing an arc detection system using a current change and a high frequency noise according to the present invention
3 is a flowchart schematically showing an arc detection method using a current change and high frequency noise according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. In the accompanying drawings, it should be noted that the same reference numerals are used in the drawings to designate the same configuration in other drawings as much as possible.

In addition, in describing the present invention, when it is determined that a detailed description of a related known function or known configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. And certain features shown in the drawings are enlarged or reduced or simplified for ease of description, the drawings and their components are not necessarily drawn to scale. However, those skilled in the art will readily understand these details.

Figure 2 is a schematic diagram showing an arc detection system using a current change and a high frequency noise according to the present invention.

As shown in FIG. 2, the arc detection system using the current change and the high frequency noise according to the present invention includes an arc detection sensor unit for detecting an arc (corona) continuously occurring on the same phase line that is adaptive to the indoor distribution line. 110, the current effective value change amount detection unit 120 for receiving the arc information detected by the arc detection sensor unit 110 to count and output the current effective value change amount, and the arc information detected by the arc detection sensor unit 110. The current high frequency detection unit 130 for detecting the current high frequency by applying a current tracking detection algorithm, and the current effective value change amount of the current effective value change amount detecting unit 120 and the current high frequency signal of the current high frequency detection unit 130 respectively. High frequency arc detection unit 140 for detecting and outputting only the arc signal, and high column output from the high frequency arc detection unit 140 Analysis of the received signal by the arc comprise a trip signal output unit 150 which outputs a circuit breaker trip signal.

Here, the arc detection sensor unit 110 serves as a current transformer sensor for current monitoring to prevent a malfunction of the circuit breaker by current monitoring.

The current effective value change amount of the current effective value change detection unit 120 and the current high frequency of the current high frequency detection unit 130 respectively output an analog signal, and the high frequency arc detection unit 130 receives the analog signal to detect the high frequency arc signal. Output a digital signal.

In this case, the detection of the current effective value change amount is checked from the detected arc information to determine whether an additional count has occurred in a section of 150 dB ≤ T ≤ 300 mA when a count of the current value effective value change is generated, and is reset if not. When the total count occurs more than 10 times including the T time zone, the trip signal of the breaker is output.

In addition, the current high frequency detects the occurrence of a change in comparison with the THD of the previous waveform while following the current value, monitors when the set THD value is 10% or more, and outputs a trip signal of the circuit breaker when the THD is continuously generated.

 The arc detection system using the current change and the high frequency noise according to the present invention configured as described above tracks the original current of 60 Hz to operate in all load regions together with the method of counting the current effective value change amount in the analog signal processing for the current. By detecting the current high frequency, by detecting only the high frequency arc signal while following the arc current, it is possible to detect the arc within 0.5 seconds and to output the cutoff signal.

3 is a flowchart schematically illustrating an arc detection method using a current change and a high frequency noise according to the present invention.

In the arc detection method using the current change and the high frequency noise according to the present invention, as shown in FIG. 3, the arc detection sensor detects the arc continuously occurring in the same phase line that is adaptive to the indoor distribution line (S110). ).

At this time, the arc count is set to 0 and increases from the time of the arc generation, and increases from the time of the arc generation in the state of setting the arc detection time (T) delay to 0ms. On the other hand, the alarm operation, including the breaker does not work so far.

Subsequently, the arc counter is received based on the detected arc information, and it is determined whether a current change amount equal to or greater than a current change amount set when the arc counter is generated (S120).

Subsequently, when a current change amount greater than the set current change amount occurs, it is determined whether an additional arc counter has been generated within a period of 150 m ≤ T ≤ 300 m after the initial counter is generated (S130).

The reason why the delay time is 150 ms is to prevent malfunction in the circuit such as an arc generated when the switch is opened and closed, and to detect a continuous arc that may lead to an accident.

On the other hand, if the current change amount of more than the set current change amount when the arc counter occurs, it is determined that the arc has not occurred and resets the entire system (S140).

Then, it is determined whether another arc has occurred after the reset process (S150). Here, if no other arc occurs, the process returns to the arc detection step, and if an arc is detected, a trip signal and an alarm signal of the breaker are generated (S160).

Subsequently, when the additional arc counter occurs, the arc counter and the arc detection duration are continuously detected (S170).

Subsequently, it is determined whether the detected arc counter and the arc detection duration are 10 or more times in the corresponding section arc counter, respectively, and the current high frequency in 5 kHz and 100 kHz is continued by 10% or more (S180).

Subsequently, when the arc counter is generated 10 times or more or the current high frequency is maintained by 10% or more, the trip signal of the breaker is output and an alarm signal is generated (S160). That is, an alarm signal is generated together with a trip signal of the circuit breaker when the arc counter is 10+ ms and the arc detection duration is 400+ ms.

Subsequently, it is determined from the detected arc information whether the current high frequency distortion rate is greater than or equal to a set value (S190). At this time, the arc counter and the arc detection duration are detected when the current high frequency distortion is greater than the set value. If the current high frequency distortion ratio is smaller than the set value, the reset process is performed and the arc is continuously detected (S200).

When the trip signal and the alarm signal of the breaker are generated, it is transmitted to the manager to determine whether to perform maintenance (S210).

On the other hand, while the technical spirit of the present invention has been described with reference to the accompanying drawings, which is illustrative of the preferred embodiments of the present invention by way of example and not intended to limit the invention. In addition, it is obvious that any person having ordinary skill in the art to which the present invention pertains can make various modifications and imitations without departing from the scope of the technical idea of the present invention.

110: arc detection sensor unit 120: current effective value change amount detection unit
130: current high frequency detection unit 140: high frequency arc detection unit
150: trip signal output unit

Claims (5)

An arc detection sensor unit for detecting arcs (coronas) continuously occurring in the same phase line adaptable to indoor distribution lines;
A current effective value change detection unit for receiving the arc information detected by the arc detection sensor unit to count and output the current effective value change amount;
A current high frequency detection unit which receives the arc information detected by the arc detection sensor unit and detects the current high frequency by applying a current tracking detection algorithm;
A high frequency arc detection unit for receiving the current effective value change amount of the current effective value change amount detecting unit and the current high frequency signal of the current high frequency detecting unit and detecting and outputting only the high frequency arc signal;
And a trip signal output unit configured to receive the high frequency arc signal output from the high frequency arc detector and to output a breaker trip and an alarm signal.
The detection of the change amount of the current effective value checks whether an additional count has occurred in the interval 150 ≤ ≤ T ≤ 300 Hz when the count of the current value effective value change is generated from the detected arc information, and resets it if it does not occur. An arc detection system using current change and high frequency noise, wherein a trip signal of a circuit breaker is output when a count occurs more than 10 times. The arc detection system of claim 1, wherein the arc detection sensor unit is a current transformer sensor for current monitoring. The method of claim 1, wherein the current effective value change amount of the current effective value change amount detector and the current high frequency current of the current high frequency detector portion respectively output an analog signal, and receive the analog signal from the high frequency arc detector to detect an arc signal of a high frequency to generate a digital signal. An arc detection system using a current change and high frequency noise, characterized in that the output. Detecting an arc (corona) continuously occurring in the same phase line adaptive to the indoor distribution line using an arc detection sensor;
Receiving the detected arc information to perform an arc counter and determining whether a current change amount equal to or greater than a current change amount set when the arc counter occurs;
Determining whether an additional arc counter is generated within a predetermined period after the initial counter occurs when the current change amount is greater than the set current change amount;
Continuously detecting an arc counter and an arc detection duration when the additional arc counter occurs;
Determining how many times the arc counter is generated in the corresponding arc counter and the arc detection duration, each of which corresponds to a current high frequency;
Outputting a trip signal of the circuit breaker and generating an alarm signal when the number of occurrences of the arc counter is higher than a reference value and the current high frequency is maintained above the reference value;
Determining whether a current high frequency distortion rate is higher than a set value from the detected arc information;
Determining whether to perform maintenance by transmitting the trip signal and the alarm signal of the circuit breaker to an administrator;
Determining that an arc has not occurred and resetting the entire system when there is no current change amount greater than a set current change amount when the arc counter is generated, and determining whether another arc has occurred after the reset process;
The detection of the change amount of the current effective value checks whether an additional count has occurred in the interval 150 ≤ ≤ T ≤ 300 Hz when the count of the current value effective value change is generated from the detected arc information, and resets it if it does not occur. An arc detection method using a current change and high frequency noise, characterized in that a trip signal of the circuit breaker is output when a count occurs 10 times or more. delete

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